Chimney cap



March 11, 1941. E Q MUTTER' 2,234,313

7 CHIMNEY CAP Filed Oct. 14, 19159 In venior EC Mu i'zer Attorneys Patented Mar. 11, 1941 UNITED STATES PATENT CHIMNEY GAB Edward C. Mutter, Cumberland, It. 1.

Application October 14, 1939, Serial No. 299,553

4 Claims.

The present invention relates to protecting caps for industrial chimneys, as well as for the chimneys of homes and has for its primary object to provide a reinforced concrete chimney cap adapted for mounting in position on the top of the chimney to protect the upper surface and edges of the chimney from deterioration by the elements, the cap including the provision of a dead air space to insulate the cap from the heat gases passing through the chimney whereby to prevent damage to the cap by the expansion and contraction thereof due to the changes in temperature to which the cap is subjected.

An important object of the present invention is to provide a chimney cap of this character of simple and practical construction, 'which is efiicient and reliable for use in prolonging the life of the chimney, which is relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a top plan view with parts broken away and shown in section.

Figure 2 is a side elevational view and Figure 3 is a vertical sectional view taken substantially on a line 33 of Fig. 2.

Referring now to the drawing in detail the numeral 5 designates a chimney of conventional construction and the cap is designated at 6. The cap is constructed of reinforced concrete, the reinforcement comprising circumferentially extending rods 1 arranged in upper and lower concentric rows and an upper group of radially extending rods 8 constituting spacing rods for the upper row of circumferential rod 1 and a lower group of radially extending rods 9 which constitute spacing rods for the lower group of circumferential rods. Vertical rod III also connects the upper and lower rows of circumferential rods and are secured thereto by tying wires H which are also utilized to secure the spacing rods 8 and 9 to the respective circumferential rods.

The lower ends of the vertical rods in extend downwardly below the cap and are embedded in the top of the chimney 5.

The cap has its upper edge beveled as shown at l2, the top of the cap being provided with the central opening l3 which registers with the opening of the chimney. The outer edge of the cap is formed with a depending skirted portion M providing a substantially close fit with the outer surface of the chimney.

The inner periphery of the cap is formed with a dead air space designated generally at l5 which is constructed of an inner row of fire brick l6 and. an outer row of fire brick ll extending vertically and circumferentially spaced from each other, the lowermost of each of said rows of fire brick resting upon the top of the chimney as will be apparent from an inspection of Fig. 3 of the m drawing. The space between the innerand outer rows of fire brick constitute the deadair space l5 which is closed at its top by fire brick I8. The

top of the cap overlies the top fire brick ll of the dead air space."

The exposed surf-aces of the cap are finished with a waterproofing compound which-is troweled on the concrete to provide asmooth exterior surface therefor as shown at l9. 'f:f'

It will be apparent from the foregoing that the lower ends of the vertical rods" Ifionstitute dowels which are embedded in the chimney whereby to firmly anchor the cap-fin position thereon. The cap serves as a complete cover for the top of the chimney and thus prevents deterioration thereof. The dead air space at the inner periphery of the cap compensates for radical changes in the temperature to which the cap might be subjected and thus prevent cracking and disintegration of the concrete due to expansion and contraction thereof.

It is believed" the details of construction, advantages and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

What is claimed is:

1. In a chimney construction, a member on top of the chimney having an opening in registry with the due of the chimney, said member also having a dead-air chamber therein surrounding the flue and a concrete cap supported on top of the chimney, and surrounding the member, said member separating the cap from the influence of heated gases passing through the fiue of the chimney.

2. In a chimney construction, an annulus constructed of built-up refractory units on top of the chimney in registery with the fiue of the chimney and having a dead-air chamber therein and a concrete cap supported on top of the chimney and surrounding the member, said member separating the cap from the influence of heated gases passing through the flue of the chimney.

'3. In a chimney construction, a double annular column of spaced refractory blocks rising from the chimney in registery with the flue of the chimney and a top bridging said columns to provide a dead-air chamber therebetween and a concrete cap mounted on the top of the chimney and surrounding said columns, said columns sepa'rating the cap from the influence of heated gases passing through the flue of the chimney.

4. In a chimney construction, a double annular column 1 spaced refractory-blocks; rising from the chimney in registery withthe flue of the chimney and a top bridging said columns to provide a dead-air chamber therebetween and a concrete cap mounted on top of the chimney and providing a cover for the outer sides and top of said columns, said columns separating the cap from the influence of heated gases passing through the flue of the chimney.

nwann c. MU'I'IER. 1o 

